A bit of information on Donlin off to the west of the anomaly.
https://www.sec.gov/Archives/edgar/data/1173420/000106299308000827/exhibit99-1.pdf
A couple of extracts in regard to your post.
"The gold occurs primarily in the lattice structure of arsenopyrite. Realgar, native arsenic and stibnite can be found generally associated with the higher-grade gold mineralization."
"Generally, direct cyanidation yields less than 10% gold recovery; whereas oxidation of the sulphides prior to cyanidation yields recoveries exceeding 90% for intrusives and 78 to 89% for the sediments"
"Concentration by flotation is efficient, being 91 to 97% for intrusives and 82 to 89% for sediments."
"There is no history of significant development or hard rock production. Minor placer gold production has taken place within the project area."
"Very rare native gold particles (1 to 20 μm) have been observed in process mineralogy studies of ACMA–Lewis area material, but most of the gold occurs in the crystal structure of arsenopyrite and, to a lesser extent, in pyrite. Fine-grained arsenopyrite (<20 μm diameter) contains 5 to 10 times more gold than coarse-grained arsenopyrite. Gold seen in polished sections occurs as 1 to 3 μmblebs with no clear paragenetic relationship to other minerals. Stibnite, realgar, and native arsenic are often associated with higher gold grades but contain very minor gold compared to arsenopyrite"
"16.1 Mineralogy Sulphur occurs primarily as pyrite and arsenopyrite. The pyrite contains only 10 to 20% of the gold, while arsenopyrite is the main carrier of gold in solid solution (sub-microscopic) form. The finest arsenopyrite has the highest gold grade. Little or no visible gold has been identified from all mineralogical investigations. Mercury (2 ppm), arsenic (2,800 ppm), antimony (80 to 90 ppm) and chloride (20 to 25 ppm) are present in the ore. Carbonate content is 3.3 to 3.4%. These elements all affect the process."
"16.2 Direct Leach / CIL The ore is refractory to direct and carbon-in-leach (CIL) cyanidation and yields very low recoveries (<15%) from either leaching methodology. High gold recovery is only achieved by destruction of the sulphidic host matrix before cyanidation."
Given Donlin is a 40MOZ and Pogo a 10MOZ resource our anomaly has the potential to be interesting. I could find nothing on Donlin geochem but Pogo shows up as a 400/500 ppb stream geochem anomaly. We are in elephant country with the right geology and anomaly. The zinc copper anomaly is screaming at 1% zinc.
I think they are a good punt.
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